Assume That Respondents Aged 70 or Older Are Only One-Third

Multiple Choice

Assume that respondents aged 70 or older are only one-third as likely to be in an Internet sample as their actual incidence in the population. Using the propensity scoring method, their responses would be:

A) excluded from the sample to avoid any potential bias.
B) included as is (only once) to keep the data truly representative.
C) counted three times in the sample.
D) included selectively (about one-third of the time) in the sample.
E) included alternatively.